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A183363
as a simple table
n
a(n)
1
1
2
3
3
18
4
138
5
3102
6
137688
7
12617557
8
2402945556
9
936460285557
10
739951660291721
[1,3,18,138,3102,137688,12617557,2402945556, 936460285557,739951660291721]